Cementless strain insulator



F. J. STEVENS. CEMENTLESS STRAIN INSULATOR.

. APPLICATION FILED JUNE 18, 1917. I

1,112,759. Patented Apr. 11, 1922.

2 SHEETS-SHEET I.

VE/VTOR UNITED STATES PATENT mm.

FRANK J. s'rRv Ns, 0F ROCHESTER,'NEW YORK, ASSIGNQR, BY MESNE AssrGNmENTs, TO LOOKE rNsuLA'roR CORPORATION, or BALTIMORE, MARYLA D, A com TION or MARYLAND.

To all whom it may concern:

Be it known that I, FRA K 'J. STEVENS, of Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Cementless Strain Insulators; and I do hereby declare the followingto be a full, clear, and exact description of the same, reference being had to theaccompanying drawings, forming a part of this specification, and to the-reference-numerals marked thereon.

My invention has to do with strain insulators of the general type'employed for conductors of high tension currents and embodying generally a series of insulating units assembled one upon the other and the pur-' 'pose of the present construction is to afford such a connection between adjacent insulator units as to obviate the necessity of using any nomical structure, which permits of ready assembling. To these and other ends the invention consists in certain improvements and combinations of parts, all as will be hereinafter more fully described, the novel features being pointed out in the claims at the end of the specification.

In the drawings:

Figure 1 is a side elevation showing a strain insulator constructed in accordance with my invention;

Figure 2 is a vertical sectional view;

Figure 3 is plan view of an insulating unit forming a part of my improvement;

Figure 4; is a bottom plan view of the same;

Figure 3 5 is an enlarged sectional View showing the parts in the position of assembling, and

Figure 6 is a horizontal sectional view taken substantially on a line (B -6 of Figure-2.

Similar reference numerals in the several figures indicate the same parts.

In the illustrative embodiment shown, I have disclosed a usual form of petticoat type of insulating member or unit designated generally by 1, which is provided with a pair of Specification of Letters Patent.

Application med June 18,

CEMEN'I'LESS STRAIN INsoLATOR.

I Patented Apr. 11', 1922. 1917. Serial o. 175,270.

exteriorly arranged sockets or recesses 2 having curved walls 3 formed by a substantially circular retaining portion &. Arranged interiorly of the insulating member is a pair of recesses or sockets 5 having curved walls 6 formed by a circular retaining portion 7. The exterior sockets 2 extend at right angles to the interior sockets recesses or sockets being so disposed as to rece ve curved arms forming parts of connectmg devices which serve to unite the insulating unit with those on opposite sides of it, 1n accordance with the usual practice in this art of employing a series of insulating units in juxtaposed relationship.

Each connecting device comprises a pair of independent cludes a pair or set of oppositely extending curved arms 6* and 6 and 7 and7 curved arms 6* and 7 form'one pair of jaws and correspondingly the curved arms 6 and 7 form another pair ofjaws, the said 'pairs of aws being connected as hereinafter set 1 forth. Lugs 6 and 7 are formed at the cen-.

tral port-ions of the members and serve as a means for connecting them together. The members of the connecting device are a plied to the two adjacent insulator units in the manner shown in Figure 5, with the curved arms of each member engaging respectively one of the interior recesses or sockets of the one unit and one of the exterlor recesses or sockets of the other unit. When thus positioned, the members of the connecting device are 'joined by a bolt or pln engaging openings in the lugs at the central portions and securely attached as shown in Figure 2. The two members of water retaining pockets, at the same time permitting the removal of one or more of .the connecting devices and the corresponding porcelain units if this should at any time be desirable. Insulating units of this type, as well as the connecting device, are comparatively simple and economical to The 5, the two pairs of members, each of which inmanufacture, and also afford great facility in their assembling.

The essential characteristic of my improvement may be carried out in ways other than that specifically set forth, and the present disclosure is by way of example of one way of adapting the improvement, and not in any sense as restricting the invention to any particular structure. I believe it new to provide an insulating unit with pairs of interior and exterior recesses, to receive corresponding pairs of arms of a connecting device, formed in two or more partswhich are suitably secured together to retain the insulator, and at the same time are separable if necessary, and the claims of this application are intended to cover any modifications or departures incorporating such idea.

I claim as my invention:

1. In a strain insulator, the combination with an insulating unit having an undercut attaching head, and a connected member, of a detachable connecting device comprising two pairs of relatively movable jaws, the jaws of either pair being adapted to engage the said attaching head, and the other pair of jaws being adapted to engage the said connected member, one jaw of each pair be ing rigidly joined to the corresponding jaw of the other pair to constitute a set, and means for connecting the two sets.

2. In a strain insulator, the combination with insulating units each having an undercut attaching head, of a detachable connecting device comprising two pairs of pivoted jaws, the jaws of either pair being adapted to engage either attaching head, one jaw of each pair being integrally connected together to constitute a set, and means for pivotally connecting the said two sets.

3. In a strain insulator, the combination with an insulating unit having an undercut attaching head, of a detachable connecting device comprising spaced pairs "of jaws, one jaw of each pair of jaws being connected to a corresponding jaw of the other pair of jaws, either pair of said jaws being adapted to engage with said attaching head, and

means pivotally connecting one jaw of each pair to the other jaw of the same pair, said means being common to both pairs of jaws whereby one of'said pairs of jaws is adapted to actuate the other pair of jaws reversely in opening or closing.

4:. In an insulator, the combination with an insulating unit having an undercut attaching head, of a detachable connecting device comprising two pairs of spaced jaws, each jaw of each pair of jaws being integral with the corresponding jaw of the other pair of jaws and forming a hook-shaped member, either pair of jaws being adapted to engage with said attaching head, and

means for pivotally connecting one of said hook-shaped members to the other whereby one of said pairs of jaws is adapted to actuate the other pair of jaws reversely in opening or closing.

5. In a strain insulator, the combination with insulating units each provided with a projecting attaching head, said heads being circular in cross section, of means for connecting said units, said means comprising a air of hook-shaped members each of which is adapted to engage the attaching heads on both of said units, and pivot means extending through said hooks and adapted to prevent separation thereof whereby the disengagement of said hooks from said attaching heads is prevented. v

6. In a strain insulator, the combination with a member having a curved surface, of

an insulating unit provided with an attaching head circular in vertical cross section, and means for operatively connecting said insulating unit .to said member, said means comprising apair of hook-shaped members each having spaced arcuate faces, said faces being adapted to engage the curved surfaceof said membenand the head on said insulating unit, and means for pivotally connectlng the said hook-shaped members at a point intermediate the insulating unit and the said member.

FRANK J. STEVENS. 

